18. Which of the following statements about mechanical wave is not correct?
a:All the electromagnetic waves are transverse
waves.
b:Transverse waves can be mechanical waves
or electromagnetic wave.
С:Mechanical waves can be transverse waves
or longitudinal waves.
d:Light is not a mechanical wave.
e:All the transverse waves are mechanical
waves.

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Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.